Exhibit A
NASHUA 13117 — Crown Street Park & Ride Project
Detailed Scope of Services — Construction Services
A NH-licensed land surveyor will be retained ta survey the location of the proposed monitoring
wells, and to perform an elevation survey of both the existing and proposed monitoring wells in
order to tie the elevations into the same datum.
Following installation and prior to collection of groundwater samples, the proposed monitoring
wells will be developed by surging and pumping. After a minimum of two weeks following
installation and development, groundwater samples will be collected from the six proposed
monitoring wells, and five existing monitoring wells (GZ-1 through GZ-4, and GZ-102). Prior to
purging, the wells will be checked for floating free product using an oil/water interface probe.
The wells will be purged/sampled using low-flow sampling techniques. Groundwater generated
during purging will be field-screened for selected water quality indicator parameters, including:
pH, dissolved oxygen (“DO”), specific conductance, temperature, oxidation/reduction potential
(“ORP”), and turbidity. Static (pre-purging) groundwater level will be measured in each well.
Groundwater samples will be submitted to a NH accredited laboratory for VOC analysis using
USEPA method 8260B.
Following completion of the above-described field activities, the data will be compiled and
analyzed, and summarized in an IRA Report. The report will provide a brief narrative description
of findings, and will present recommendations with regard to the need for additional
investigative or remedial measures to address the observed groundwater conditions. The report
will contain the following supporting components:
e Tabular summaries of groundwater sampling/analytical data, which will include the
relevant state of NH regulatory standards;
e Monitoring well logs;
e A groundwater elevation contour plan, prepared based on the water levels measured
in the existing and proposed site wells;
e A contaminant distribution plan that shows the observed extent of VOC
contamination of groundwater; and
e Copies of the laboratory analytical reports.
Key issues discussed in the IRA report are anticipated to include: an evaluation of the extent
and apparent direction of migration of the observed groundwater contamination, the potential for
off-site migration of the contamination, and a preliminary assessment as to whether the
source(s) of the plume are located on-site or upgradient/off-site.
Scope Assumptions:
1. MJ’s resident construction observer will be provided office space and the necessary
equipment will be supplied by the Contractor per the construction contract.
2. A materials testing company will be used to perform all required material testing required by
the contract specifications and NHDOT’s LPA program. The cost for the testing is shown as
a direct expense.
Al
Sd McFarland Johnson Page 3 of 3 February 10, 2017
